脚本（三）：jpsall(查看三台服务器Java进程脚本)
#!/bin/bash
for host in hadoop102 hadoop103 hadoop104
do
echo =============== $host ===============
ssh $host jps
done
#!/bin/bash
for host in hadoop102 hadoop103 hadoop104
do
echo =============== $host ===============
ssh $host jps
done
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